I don't think the lifter should be flying in that analogy, even if it is air.
But forget cars for a second, and think of it this way:
Imagine you have a spring, like this:

This is pretty much what an area of higher air pressure looks like. It pushes outwards on the things that are holding it at either end - the things that are compressing it (the hands in the picture, or the neck and hands of characters in our story)
A compressed spring cannot push on one thing. It must exert force in both directions.
If the hand on the left were not there, would the spring still push on the right hand? No, it would expand leftwards until it reached its normal, uncompressed length (or atmospheric pressure for air). Similarly, you cannot compress a spring just by pushing on one end. You need to have something holding it on the other end, or else it just slides along.
You could also approach this through newton's third law of motion - forces come in pairs; for every action, there is an equal and opposite reaction. In this case, the action is that Geoff's air is pushing on Mishka's hands. The reaction is that Mishka's hands push back on the air.
Now remember that the compressed air is a spring, attached to the hands at one end, and that a spring can only exert a force to push things apart when there are things at both ends to be pushed. What is at the other end of the spring? What is on the opposite side of the pressurised air from Mishka's hands? It is Graham's thin, flimsy and all-too-breakable neck.
Ouch.
If I were you, I'd try to find a different way to rescue our poor boy than prying off these super-strong hands while using his neck as a brace to push against. It can be done, I'm sure.